Mixed-valence hydroxides as bioorganic host minerals

Kuma, Kenshi; Paplawsky, W.; Gedulin, B.; Arrhenius, Gustaf

doi:10.1007/bf01808119

Cited by 59 publications

(35 citation statements)

References 49 publications

(28 reference statements)

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“…The preparation was performed in a N2 atmosphere to exclude carbon dioxide from the LDHs. The pHs adopted were the ones reported by Kuma et al 23 The basic strategy involved addition of an M II /M III metal salt solution to a basic solution of NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page.…”

Section: Preparation Of the Undecenoate Ldhsmentioning

confidence: 99%

Aluminum-containing layered double hydroxides: the thermal, mechanical, and fire properties of (nano)composites of poly(methyl methacrylate)

et al. 2008

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Hydrotalcite-like anionic clays or layered double hydroxides (LDHs IntroductionIn recent years, polymer-inorganic nanocomposites have been the subject of extensive research. Previous studies on the layered materials have mainly focused on the layered silicates and polymerlayered silicate nanocomposites, 1 because of the relatively low layer charge density and the easy exfoliation of montmorillonite (MMT)-type layered silicate compounds. Anionic clays are also of interest as they may have properties that are parallel to or divergent from those of the cationic clays. The most well-known anionic clays are the hydrotalcitelike layered double hydroxides or LDHs. 2 LDHs have a much higher charge density than MMT in the interlayer and a stronger interaction among the hydroxide sheets than layered silicates, which makes the exfoliation of LDHs much more difficult. 3 Recently, a number of reports on the exfoliation of LDHs 4 and NOT THE PUBLISHED VERSION; this is the author's final, peer-reviewed manuscript. The published version may be accessed by following the link in the citation at the bottom of the page. Chemistry, Vol. 18, No. 26 (2008): pg. 3091-3102. DOI. This article is © Royal Society of Chmistry and permission has been granted for this version to appear in e-Publications@Marquette. Royal Society of Chmistry does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from Royal Society of Chmistry. Journal of Materials3 polymer-LDH exfoliated nanocomposites 5 have been published. These synthetic anionic clays are emerging as potential fire retardants. 6 Layered double hydroxides consist of positively charged metal hydroxides sheets with anions (along with water) located between the layers to compensate the charge on the layers. 7 The LDH structure is described with the ideal formula [ , and various carboxylates, etc.; intra and inter denote the intralayer domain and the interlayer space, respectively. The LDH structure consists of brucite-like layers constituted of edge-sharing M(OH)6 octahedra. 8 Partial M III for M II substitution induces a positive charge on the layers, balanced by the presence of the interlayer anions. LDHs then consist of a stacking of positively charged layers with anions intercalated in the interlayer region, usually referred to as the gallery space, together with water molecules. LDHs exhibit anion-exchange properties 9 and their interlayer spacing can change depending on the size of the intercalated anions. 10 When heated above about 600 °C, these materials lead to mixed oxides. 11The presence of an organic moiety in the LDH gallery space plays an important role in the preparation of the LDH-polymer nanocomposites. Pinnavaia et al.12 reported a Mg 2+ /Al 3+ /Cl -LDH with a gallery height of approximately 2.97 Å. The size of the interlayer space was calculated from a basal spacing of 7.74 Å (indicated by X-ray powder diffraction) and the thickness of the brucite layer (4.77 Å). The gallery distance between each ...

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Section: Preparation Of the Undecenoate Ldhsmentioning

confidence: 99%

Aluminum-containing layered double hydroxides: the thermal, mechanical, and fire properties of (nano)composites of poly(methyl methacrylate)

et al. 2008

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“…The diffraction peaks are indexed according to the 3R symmetry (Cavani et al, 1991;Kuma et al, 1989;Rives & Ulibarri, 1999). The intensity of the diffraction peak corresponding to the [003] plane is almost the same, irrespective of the treatment time.…”

Section: Formation Of Nanosheets On Magnesium Alloy Surfacementioning

confidence: 99%

High Functionalization of Magnesium Alloy Surface by Superhydrophobic Treatment

Ishizaki¹,

Lee²,

Teshima³

2011

Magnesium Alloys - Corrosion and Surface Treatments

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“…Os cátions divalentes mais comum são o Mg, Mn, Fe, Co, Ni, Cu, Zn e Ca; enquanto que os cátions trivalentes mais comuns são o Al, Cr, Mn, Fe, Co, Ni [3]. Muitos autores utilizam várias combinações destes cátions di e trivalentes na síntese de HDLs, obtendo resultados variados, dependendo da composição e do método de síntese utilizado [4][5][6]. Dependendo de sua composição, cristalinidade, estabilidade térmica e outras propriedades físico-químicas, os HDLs podem apresentar uma grande variedade de aplicações.…”

Section: Introductionunclassified

Síntese e caracterização de hidróxidos duplos a partir da lama vermelha

Cunha

Corrêa

2011

Cerâmica

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da região interlamelar. O material resultante adsorve anions quando colocado em soluções e reverte a estrutura da hidrotalcita. Avanços signifi cativos têm sido alcançados recentemente na caracterização desses materiais, incluindo estudos estruturais sobre o mecanismo de intercalação. O objetivo desse trabalho foi a síntese e caracterização de HDLs a partir da lama vermelha, e testar esses materiais como adsorventes de metais pesados. Palavras-chave: lama vermelha, hidróxidos duplos lamelares, síntese. Abstract

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Mixed-valence hydroxides as bioorganic host minerals

Cited by 59 publications

References 49 publications

Aluminum-containing layered double hydroxides: the thermal, mechanical, and fire properties of (nano)composites of poly(methyl methacrylate)

Aluminum-containing layered double hydroxides: the thermal, mechanical, and fire properties of (nano)composites of poly(methyl methacrylate)

High Functionalization of Magnesium Alloy Surface by Superhydrophobic Treatment

Síntese e caracterização de hidróxidos duplos a partir da lama vermelha

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